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Sirine C. Fakra
Lawrence Berkeley National Laboratory
114Publications
36H-index
4,905Citations
Publications 114
Newest
#1Elizabeth M. Boatman (Wake Forest University)
#2Mark B. Goodwin (University of California, Berkeley)H-Index: 18
Last.Mary H. SchweitzerH-Index: 25
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The idea that original soft tissue structures and the native structural proteins comprising them can persist across geological time is controversial, in part because rigorous and testable mechanisms that can occur under natural conditions, resulting in such preservation, have not been well defined. Here, we evaluate two non-enzymatic structural protein crosslinking mechanisms, Fenton chemistry and glycation, for their possible contribution to the preservation of blood vessel structures recovered...
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#1Sharon A. Newman (MIT: Massachusetts Institute of Technology)H-Index: 6
#2Mirna Daye (MIT: Massachusetts Institute of Technology)H-Index: 2
Last.Tanja Bosak (MIT: Massachusetts Institute of Technology)H-Index: 23
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Siliciclastic sediments of the Ediacaran Period contain exceptionally preserved fossils of macroscopic organisms, including three-dimensional casts and molds commonly found in sandstones and siltstones and some two-dimensional compressions reported in shales. The sporadic and variable associations of these exceptionally preserved macroscopic fossils with pyrite, clay minerals, and microbial fossils and textures complicate our understanding of fossilization processes. This hinders inferences abou...
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#1Joseph R. Salazar (DU: University of Denver)H-Index: 1
#2Benton T. Cartledge (DU: University of Denver)H-Index: 2
Last.Brian J. Majestic (DU: University of Denver)H-Index: 11
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Abstract. Iron is the most abundant transition element in airborne PM, primarily existing as Fe(II) or Fe(III). Generally, the fraction of water-soluble iron is greater in urban areas compared to areas dominated by crustal emissions. To better understand the origin of water-soluble iron in urban areas, tail-pipe emission samples were collected from 32 vehicles with emission certifications of Tier 0, low emission vehicles (LEV I), tier two low emission vehicles (LEV II), ultralow emission vehicle...
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More than a billion people worldwide may be selenium (Se) deficient, and supplementation with Se-rich Brazil nuts may be a good strategy to prevent deficiency. Since different forms of Se have different nutritional value, and Se is toxic at elevated levels, careful seed characterization is important. Variation in Se concentration and correlations of this element with other nutrients were found in two batches of commercially available nuts. Selenium tissue localization and speciation were further...
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#1Christine N. PrinsH-Index: 4
#2Laura J. HantzisH-Index: 4
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Elemental hyperaccumulation protects plants from many aboveground herbivores. Little is known about effects of hyperaccumulation on belowground herbivores or their ecological interactions. To examine effects of plant selenium (Se) hyperaccumulation on nematode root herbivory, we investigated spatial distribution and speciation of Se in hyperaccumulator roots using X-ray microprobe analysis, and effects of root Se concentration on root-associated nematode communities. Perennial hyperaccumulators ...
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We present extended X-ray absorption fine structure (EXAFS) spectra and modeling of a series of structurally tunable quasi-one-dimensional mixed-valence platinum–halide linear chain materials, [Pt(en2)][Pt(en2)X2](ClO4)4 with X = Cl, Br, I. The materials exhibit a commensurate charge density wave with fractional charge states on alternating platinum ions in the chain, as well as a Peierls distortion with alternating platinum–halide bond lengths. The amplitude of the charge density wave and, corr...
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#1Xiang Gao (University of California, Berkeley)
#2Xiaokun Pei (University of California, Berkeley)H-Index: 5
Last.Roya Maboudian (University of California, Berkeley)H-Index: 54
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Author(s): Gao, Xiang; Pei, Xiaokun; Gardner, David W; Diercks, Christian S; Lee, Seungkyu; Rungtaweevoranit, Bunyarat; Prevot, Mathieu S; Zhu, Chenhui; Fakra, Sirine; Maboudian, Roya | Abstract: Nanocasting based on porous templates is a powerful strategy in accessing materials and structures that are difficult to form by bottom-up syntheses in a controlled fashion. A facile synthetic strategy for casting ordered, nanoporous platinum (NP-Pt) networks with a high degree of control by using metal...
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Particulate methane monooxygenase (pMMO) is an enzyme that oxidizes methane to methanol with high activity and selectivity. Limited success has been achieved in incorporating biologically relevant ligands for the formation of such active site in a synthetic system. Here, we report the design and synthesis of metal–organic framework (MOF) catalysts inspired by pMMO for selective methane oxidation to methanol. By judicious selection of a framework with appropriate topology and chemical functionali...
18 CitationsSource
#1Ying Jiang (CAU: China Agricultural University)H-Index: 2
#2Ali F. El Mehdawi (CSU: Colorado State University)H-Index: 9
Last.Elizabeth A. H. Pilon-Smits (CSU: Colorado State University)H-Index: 53
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Buckwheat is an important crop species in areas of selenium (Se) deficiency. To obtain better insight into their Se metabolic properties, common buckwheat (Fagopyrum esculentum) and tartary buckwheat (F. tataricum) were supplied with different concentrations of Se, supplied as selenate, selenite, or Astragalus bisulcatus plant extract (methyl-selenocysteine). Se was supplied at different developmental stages, with different durations, and in the presence or absence of potentially competing ions,...
1 CitationsSource
#1Stormy Dawn Lindblom (CSU: Colorado State University)H-Index: 13
#2Ami L. Wangeline (Laramie County Community College)H-Index: 7
Last.Elizabeth A. H. Pilon-Smits (CSU: Colorado State University)H-Index: 53
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Endophytes can enhance plant stress tolerance by promoting growth and affecting elemental accumulation, which may be useful in phytoremediation. In earlier studies, up to 35% elemental selenium (Se0) was found in Se hyperaccumulator Astragalus bisulcatus. Since Se0 can be produced by microbes, the plant Se0 was hypothesized to be microbe-derived. Here we characterize a fungal endophyte of A. bisulcatus named A2. It is common in seeds from natural seleniferous habitat containing 1,000-10,000 mg k...
3 CitationsSource
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